ORA-12545

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ORA-12545

Roshan
Hello Erman,

hope all good.

we encountered an error from dollar u server whereby all jobs crashed at 09:47pm on 05 FEB 26.

ORA-12545

dollar u is AIX

these errors were present on 03 FEB  on aix not on -5
Feb  3 10:32:12 dsengprod daemon:crit syslog[2752828]: Server network message error from - expecting [HANDSHAKE PREAMBLE
] got type=12081
Feb  3 10:32:12 dsengprod daemon:crit syslog[2752828]: Server network message error from - expecting [HANDSHAKE PREAMBLE
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Re: ORA-12545

ErmanArslansOracleBlog
Administrator
This post was updated on .
This may be a Port Scanner, or a Load Balancer health check hitting the Oracle or application ports.

It confuses the listener, causing it to drop the connection attempt...

This may be the case. But I m not sure.. Review with your Sys admin and Oracle Database admin for getting more clues about the source / client ip of the faulty listener traffic.

So check alert log, listener log, AIX logs... But it may be due to an unrelated client hitting listener port unexpectedly.